51870720 has 176 divisors, whose sum is σ = 181577088. Its totient is φ = 12533760.

The previous prime is 51870677. The next prime is 51870733. The reversal of 51870720 is 2707815.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (176).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168807 + ... + 169113.

It is an arithmetic number, because the mean of its divisors is an integer number (1031688).

Almost surely, 2^51870720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51870720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90788544).

51870720 is an abundant number, since it is smaller than the sum of its proper divisors (129706368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51870720 is a wasteful number, since it uses less digits than its factorization.

51870720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 328 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 51870720 is about 7202.1330173776. The cubic root of 51870720 is about 372.9415390892.

The spelling of 51870720 in words is "fifty-one million, eight hundred seventy thousand, seven hundred twenty".